Ekubeni ubisi yisiselo esitsha, iimfuno zococeko, iibhaktheriya, ukushisa, njl.Ngoko ke, kukho iimfuno ezikhethekileyo zokuprintwa kweengxowa zokupakisha, okwenza ukuprintwa kwefilimu yokupakisha ubisi kuhluke kwezinye iimpawu zobugcisa bokushicilela.Ukukhethwa kwefilimu yokupakisha ubisi, kufuneka ihlangabezane neemfuno zokupakisha, ukuprinta, ukucubungula, ukugcinwa kunye nokuthutha kunye nococeko.Okwangoku, izinto zefilimu ezisetyenziswa ngokuqhelekileyo ziyi-polyethylene (PE) ifilimu edibeneyo edibeneyo, enyibilika i-polyethylene resin kunye ne-blow molding.
Iindidi zeefilimu zokupakishwa kobisi:
Ngokwesakhiwo sayo somaleko, inokwahlulwa ngokwesiseko ibe ziindidi ezintathu.
1. Ifilimu yokupakisha elula
Ngokuqhelekileyo yifilimu enomgangatho omnye, eveliswa ngokudibanisa inxalenye ethile ye-masterbatch emhlophe kwizinto ezahlukeneyo ze-polyethylene kwaye iveliswa ngezixhobo zefilimu ezivuthelweyo.Le filimu yokupakisha inesakhiwo esingenasithintelo kwaye ishushu-izaliswe yi-pasteurization (85 ° C / 30min), kunye nobomi obufutshane beshelufu (malunga neentsuku ezi-3).
2. Ifilimu yokupakisha ye-Black and white co-extrusion enesakhiwo esinemigangatho emithathu
Ifilimu edibeneyo yokusebenza okuphezulu eyenziwe yi-LDPE, i-LLDPE, i-EVOH, i-MLLDPE kunye nezinye i-resin, i-co-extruded kwaye ivuthelwe ngee-masterbatches ezimnyama namhlophe.I-masterbatch emnyama eyongezwe kwi-heat-seal layer yangaphakathi idlala indima yokuthintela ukukhanya.Le filimu yokupakisha ithatha ubushushu obuphezulu kakhulu bokuvala inzala ngoko nangoko kunye neendlela zokuvala inzala ngehydrogen peroxide, kwaye ubomi beshelufu kwiqondo lobushushu begumbi bunokufikelela malunga neentsuku ezingama-30.
3. Ifilimu yokupakisha ye-Black and white co-extrusion ene-five-layer structure
Uluhlu lwesithintelo esiphakathi (esiqulunqwe ngama-resin aphezulu-barriers ezifana ne-EVA kunye ne-EVAL) yongezwa xa ifilimu ivuthelwa.Ke ngoko, le filimu yokupakisha yifilimu yokupakisha ye-aseptic ephezulu ene-shelf yobomi obude kwaye inokugcinwa kwindawo yobushushu begumbi malunga neentsuku ezingama-90.Iifilimu zokupakisha ezinoluhlu oluthathu kunye nomhlophe kunye nomhlophe kunye ne-co-extruded co-extruded zineempawu ezibalaseleyo zokutywinwa kobushushu, ukuchasana nokukhanya kunye ne-oxygen, kwaye zineenzuzo zexabiso eliphantsi, ukuthuthwa okufanelekileyo, indawo yokugcina encinci, kunye nokusebenza okunamandla.
Iimfuno zokusebenza zefilimu ye-polyethylene kwiimveliso zobisi:
Ukuze uhlangabezane neemfuno zokuzaliswa kobisi kunye nokuprintwa, le miba ilandelayo ifunwa kakhulu kwifilimu ye-polyethylene.
1. Ukuguda
Indawo yangaphakathi nangaphandle yefilimu kufuneka ibe nobuhle obuhle bokuqinisekisa ukuba inokuzaliswa kakuhle kumatshini wokuzalisa ngokuzenzekelayo.Ngoko ke, i-coefficient eguquguqukayo kunye ne-static ye-friction yommandla wefilimu kufuneka ibe ngaphantsi, ngokubanzi idinga i-0.2 ukuya kwi-0.4 ukugudiswa kwefilimu Emva kokuba ifilimu yenziwe, i-agent ye-slip ifuduka isuka kwifilimu iye phezulu kwaye iqokelele ibe ngumaleko obhityileyo ofanayo. , enokunciphisa kakhulu i-coefficient ye-friction yefilimu kwaye yenze ifilimu ibe nokuguda okuhle.Isiphumo.
2. Amandla okuqina
Ekubeni ifilimu yeplastiki ixhomekeke kuxinzelelo lomatshini ukusuka kumatshini wokuzalisa ngokuzenzekelayo ngexesha lenkqubo yokuzalisa, kuyimfuneko ukuba ifilimu kufuneka ibe namandla okwaneleyo okuthintela ukukhutshelwa phantsi koxinzelelo lomatshini wokuzalisa ngokuzenzekelayo.Kwinkqubo yokuvuthela ifilimu, ukusetyenziswa kwe-LDPE okanye i-HDPE i-particle ene-melt index ephantsi kunenzuzo kakhulu ekuphuculeni amandla okuqina kweefilimu ze-polyethylene.
3. Uxinzelelo lokumanzisa phezu komhlaba
Ukuze wenze inki yoshicilelo isasazeke, imanzi kwaye ibambelele ngokutyibilikayo kumphezulu wefilimu yeplastiki ye-polyethylene, kuyafuneka ukuba ukuxinezeleka komphezulu wefilimu kufuneka kufikelele kumgangatho othile, kwaye kuyimfuneko ukuthembela kunyango lwe-corona ukuze ufezekise a uxinzelelo olumanzi oluphezulu, ngaphandle koko luya kuchaphazela i-inki kwifilimu.Ukubambelela kunye nokuqina komphezulu, ngaloo ndlela kuchaphazela umgangatho wento eprintiweyo.Ngokuqhelekileyo kuyimfuneko ukuba ukunyanzeliswa komphezulu wefilimu ye-polyethylene kufuneka ibe ngaphezu kwe-38dyne, kwaye kungcono ukuba inokufikelela ngaphezu kwe-40dyne.Ekubeni i-polyethylene yinto eqhelekileyo engekho yepolymer, ayiquki amaqela e-polar kwisakhiwo sayo se-molecular, kwaye ine-crystallinity ephezulu, i-low surface free energy, i-inertness enamandla, kunye neepropati ezizinzileyo zeekhemikhali.Ngoko ke, ukufaneleka kokuprintwa kwezinto zefilimu kuphezulu kakhulu.Ihlwempu, ukunamathela kwi-inki ayifanelekanga.
4. Ukutywinwa kobushushu
Eyona nto ixhalabisayo malunga nokupakishwa kwefilimu ngokuzenzekelayo yingxaki yokuphulwa kwengxowa ebangelwa ukuvuza kunye nokutywinwa kobuxoki.Ngoko ke, ifilimu kufuneka ibe neendawo ezintle zokwenza ibhegi yokutywina, ukusebenza kakuhle kokutywinwa, kunye noluhlu olubanzi lokutywinwa kobushushu, ukwenzela ukuba lusetyenziswe ekupakisheni.Xa isantya sitshintsha, isiphumo sokutywinwa kobushushu asichaphazeli kakhulu, kwaye i-MLDPE isoloko isetyenziswa njengomaleko wokutywina ubushushu ukuqinisekisa ngokupheleleyo ukuzinza kweemeko zokutywinwa kobushushu kunye nokutywinwa kobushushu.Oko kukuthi, kuyimfuneko ukuqinisekisa ukutywinwa kobushushu kunye nokukwazi ukusika kakuhle ukuze i-resin etyhidiweyo inganamatheli kwimela.
Ukongeza umlinganiselo othile we-LLDPE kwinkqubo yokuvuthela ifilimu kunokuphucula kakhulu ubushushu obuphantsi bokutywinwa kobushushu kunye nokusebenza kokutywinwa kobushushu kwefilimu, kodwa inani le-LLDPE elongeziweyo akufanele libe likhulu kakhulu, ngaphandle koko i-viscosity yefilimu ye-polyethylene iya kuba phezulu kakhulu, kunye nenkqubo yokutywinwa kobushushu Ithanda ukuncamathela ukusilela kwemela.Ngoyilo lwesakhiwo sefilimu, ifilimu yokupakisha yesakhiwo esihambelanayo inokukhethwa ngokwemixholo eyahlukeneyo yepakethe kunye nobomi bayo beshelufu.
Ixesha lokuposa: Jul-04-2022